The MD (Preset) Series is a 4 digits LED single level preset counter in a DIN 72 x 72 panel size (Panel Cut-out size: 68 x 68mm). This is a very simple additive preset counter but functional. With a count speed of 1kHz maximum, this counter accepts Contact or Non-Contact pulse input. It is equipped with an internal contact relay and NPN Open collector, which sends an output signal when the preset value is reached. Preset value can easily be set via the front panel digital switches and there are LED indicators which shows the state of the unit. The MD Series is powered by AC100/110V or AC200/220V, selectable, and it has an external power supply of DC12V for sensors. The unit can only be reset remotely, auto reset or by power reset. Memory is optional.
| Models | Digits | Preset | Preset Digits | Preset Range | Memory | Weight |
| MD-144 | 4 | 1 | 4 | 1 – 9999 | – | 540 g |
| MD-144M | 4 | 1 – 9999 | O | 560 g |
| Models | MD-144 | MD-144M |
| Display | Red LED, 14.22 x 8.13mm (Zero Suppress) | |
| Input Method / Signal |
Contact Input : Relay, Microswitch Non-Contact Input : L : 0 – 1V ; H : 4.5 – 27 |
|
| Count Mode | Additive only | |
| Count Speed | Contact Input : 20 Hz max. / Non-Contact Input : 1000 Hz max. | |
| Pulse Width | Contact Input : 25 msec min. / Non-Contact Input : 0.5 msec min. | |
| Make (Duty) | 1 : 1 | |
| Output Type | Contact output : Relay Type 1A only (AC250V, 0.5A / DC30V, 2A maximum Load) Non-contact output : NPN open collector (DC30V, 100mA maximum) |
|
| Output Display | Turns ON during output time | |
| Output Time | One-shot mode : 0.2 / 1sec Overrun mode : Infinite |
|
| Reset | Remote reset (100msec min.) Auto reset : One-shot reset (Output relay – 0.2s /1s reset) |
|
| Memory | None | E²PROM (10 years. retention, 10,000 times) |
| Power Source for Sensor | DC12V 30mA maximum | |
| Input Impedance | 5kΩ | |
| Power Source | AC100/110V or AC200/220V ±10%, 50/60 Hz | |
| Power Consumption | Approximately 4VA | |
| Operating Temperature | -5 – +40°C (non-freezing) | 0 – 40°C (non-freezing) |
| Operating Humidity | 45 – 85%RH (non-condensing) | |
| Hi-pot Test | AC1500V (1 minute) | |
| Dielectric Test | 20MΩ min. (DC500V megger) | |
| Connection | M3 Terminal Screw | |
